package com.items.blog.config;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.items.blog.model.Result;
import lombok.SneakyThrows;
import org.springframework.core.MethodParameter;
import org.springframework.http.MediaType;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;

 //统一返回结果

@ControllerAdvice
public class ResponseAdvice implements ResponseBodyAdvice {

    @Override
    public boolean supports(MethodParameter returnType, Class converterType) {
        return true;
    }

    @SneakyThrows
    @Override
    public Object beforeBodyWrite(Object body, MethodParameter returnType, MediaType selectedContentType, Class selectedConverterType, ServerHttpRequest request, ServerHttpResponse response) {
        //返回之前的处理
       if (body instanceof Result){
           return body;
       }
       //返回String 直接报错
        if(body instanceof  String){
            ObjectMapper objectMapper = new ObjectMapper();
            //转换为String类型
            return  objectMapper.writeValueAsString(Result.success(body));
        }
        //其他情况，返回body 然后封装
        return Result.success(body);
    }
}
